TheHadoopDistributed File System (HDFS) is adistributed file systemoptimized to store large files and provideshigh throughputaccess to data. HDFS was introduced from a usage and programming perspective inChapter 3and its architectural details are covered here. In HDFS, files are divided into blocks ...
Note that this monitoring functionality was handled by TaskTrackers and JobTrackers in MR v1, which led to overloading the JobTracker. 资源管理器监控集群内的可用资源,并在应用管理器提出自愿申请的时候提供资源。应用管理器协调应用间的资源来运行任务。应用管理器同时还追踪和监管应用的进程。在MR v1阶段...
When MapReduce was introduced in 2004 by Google engineers [41], it had some early critics [42], but was considered by many to be revolutionary. Regardless of the differing opinions on the value of this idea, it paved the road for Hadoop, which has played a significant role in ushering i...
Hadoop, which was built based on the Google proposed algorithm MpaReduce, was first introduced by Doug Cutting and his group in 2005. Then it became an Apache project in 2008 and its improved second version was released in 2012. Hadoop has dominated the Big-Data framework area that it is ...
In addition to the improved scalability, performance, and isolation provided by the introduction of NameNode federation, Hadoop 2.0 also introduced high availability for the NameNodes. 2— NameNode High Availability Prior to Hadoop 2.0, if the NameNode failed, the entire cluster was unavailable unt...
HBaseSink (org.apache.flume.sink.hbase.HBaseSink) supports secure HBase clusters and also the novel HBase IPC that was introduced in the version HBase 0.96. AsyncHBaseSink (org.apache.flume.sink.hbase.AsyncHBaseSink) has better performance than HBase sink as it can easily make non-bloc...
The Yarn is an acronym for Yet Another Resource Negotiator which is a resource management layer in Hadoop. It was introduced in 2013 in Hadoop 2.0 architecture as to overcome the limitations of MapReduce. Yarn supports other various others distributed computing paradigms which are deployed by the ...
cluster. I could modify the metastore to update with the new IP everytime I bring up a cluster. But the easier and simpler solution was to just use an elastic IP for the master 所以要将metastore中的之前出现的namenode地址全部更换为现有的namenode地址 ...
cluster. I could modify the metastore to update with the new IP everytime I bring up a cluster. But the easier and simpler solution was to just use an elastic IP for the master 所以要将metastore中的之前出现的namenode地址全部更换为现有的namenode地址 ...
Doug Cutting—who created Apache Lucene, a popular text search library—was the man behind the creation of Apache Hadoop. Hadoop got introduced in 2002 with Apache Nutch, an open-source web search engine, which was part of the Lucene project. ...